btw, i just noted this bug had been filed in bugzilla: 138674 On Wed, 24 Nov 2004, Peter Teuben wrote: > On Thu, 25 Nov 2004, Ow Mun Heng wrote: > > > Guys, > > > > I've heard that hdparm does not run on scsi drives.(SATA included) > > > > I've tried to use hdparm anyway, and it gave results. But the results > > are seriously _out_of_this_world (for me). > > > > Can anyone validate these? > > try running it successive times. On my SATA i see the disk reads continue > to grow by the amount of the first measurement. I'm also getting an > error message though, > > Timing buffered disk reads: 156 MB in 3.06 seconds = 50.90 MB/sec > Timing buffered disk reads: 302 MB in 3.01 seconds = 100.45 MB/sec > Timing buffered disk reads: 442 MB in 3.02 seconds = 146.19 MB/sec > .... > BLKFLSBUF failed: Operation not supported > HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported > > > as if hdparm remembers the buffer it read the last time.... Despite that, > 51MB/sec is not bad. But your 146.9 sounds like the 3rd measurement :-) > > > > > /dev/sda: > > Timing buffer-cache reads: 2416 MB in 2.00 seconds = 1208.18 MB/sec > > Timing buffered disk reads: 444 MB in 3.02 seconds = 146.90 MB/sec > > > > > > Compared to my Laptop's 80GB (Hitachi) PATA (5400rpm) > > > > /dev/hda: > > Timing cached reads: 1492 MB in 2.01 seconds = 742.40 MB/sec > > Timing buffered disk reads: 112 MB in 3.04 seconds = 36.85 MB/sec > > > > > > >
